Final answer:
In an automatic transmission, the torque converter eliminates the need for a driver-operated clutch. It adjusts the gear ratios automatically to provide smooth transitions between gears.
Step-by-step explanation:
In an automatic transmission, there is no need for a driver-operated clutch because the transmission system uses a torque converter. The torque converter is a fluid coupling between the engine and the transmission that allows the engine to keep running even when the vehicle is stopped. It eliminates the need for the driver to manually engage and disengage the clutch.
When the driver shifts gears in an automatic transmission, the torque converter automatically adjusts the gear ratios to transmit the power from the engine to the wheels smoothly. This allows for a seamless transition between gears without the need for a clutch pedal.
For example, when the driver accelerates, the torque converter increases the gear ratio to provide more power to the wheels. When the driver decelerates, the torque converter decreases the gear ratio to provide more control and stability.